I bought a spark fun inventors kit in order to learn about arduino. I am attempting to complete circuit 13 http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Kits/SFE03-0012-SIK.Guide-300dpi-01.pdf . It is a circuit to control 2 LEDs using a relay. I know I have the relay hooked up correctly because I can hear it click, but instead of the first LED turning off and the second LED turning on the first LED dims. Then when the relay clicks again the first LED brightens. I'm not sure what I have done wrong but no matter how many times I undo the circuit and start over I get the same result. I am especially confused because from what I understand a relay functions like a digital on/off switch. So I cannot understand why the first LED would dim instead of just turning off, even if I didn't have the second LED connected correctly.
Any tips/pointer/advice would be really appreciated. This is driving me nuts. Thanks.